sleeves and bigger bore?

[finboy]

i've seen pictures of a porsche 4 cyl on another forum.

2.5, resleeved, overbored to 2.8 with custom pistons.

has anyone tried anything similar with the dodge 2.5?

how about 2.2 overbored to 2.5 (shorter stroke, larger displacement)?

[mpbiv]

Well since our motors are already iron block, you just bore the block out more. Sleeves are generally for aluminum blocks. In our cars they are only used to repair cylinders in bad condition and then they can only be used in 2 cylinders max, and not adjacent.

[Mr P-body]

Have you looked into Nicosil coating the cylinder walls. Its a very hard coating that allows you to run thin wall thickness but still have maximum durability. Alot of guy's use it in the bore's of aluminum blocks without sleeves so you get an extra .200 in the bore. they actually run the piston and ring in on the aluminum bore itself with coating. It is very expensive and you need a diamond hone with special honing proceedures.

[crazymadbastard]

Quote:

Originally posted by Mr P-body Have you looked into Nicosil coating the cylinder walls. Its a very hard coating that allows you to run thin wall thickness but still have maximum durability. Alot of guy's use it in the bore's of aluminum blocks without sleeves so you get an extra .200 in the bore. they actually run the piston and ring in on the aluminum bore itself with coating. It is very expensive and you need a diamond hone with special honing proceedures.

that sounds pretty trick, and should go very well with my one-off billet crank and un-obtanium rods

[Klaus10]

Potential overbore on the 2.2/2.5 is very limited due to the siamesed cylinders.

Quote:

un-obtanium rods

he he good movie

you also need cast iron piston rings

[Chris Faulk]

Quote:

Originally posted by mpbiv Well since our motors are already iron block, you just bore the block out more. Sleeves are generally for aluminum blocks. In our cars they are only used to repair cylinders in bad condition and then they can only be used in 2 cylinders max, and not adjacent.

Not exactly iron. Better stated is high-nickel content right?!

I've seen 2.2/2.5 turbo blocks repaired with sleeves where there was a hole you could put your hand into. As long at the top 1-inch of the cylinder is good, just about anything is repairable.

I've also seen 3 cylinders repaired...and adjacent 2 cylinders repaired. I'd rather say it's a matter of how good your machine shop is.

A lot can be done if you do it right.

[cj011]

okay two questions?
- why does the siamese cylinders affect bore and sleeving?
- do you folks know of anyone that sells or has info on Nicasil coating? didn't find much on google.